David Woolley wrote on Sunday, August 17, 2008 at 1:02 PM
Actually one might put them on the input, in the sense that one might have
a balanced feeder at close to 200 ohms and a balanced tuner at the antenna
end. That's probably the only case in which they would work well. (Given
that good balanced feeders are rather more than 200 ohms (although twisted
pair is less), 4:1 is a compromise between easy engineering and optimum
match.
Good 200 ohm open wire line can be built using four wires in the
cross-connected configuration, I have been using such feeders for long runs
(kept under tension) at HF and 6m / 2m during the past 50 years. Leaves and
small twigs can get caught between the wires, especially in the Fall, so the
occasional inspection is required. Flashover has never been a problem in my
experience even while running a kW when living in Canada.
73,
Geoff
GM4ESD
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